Free CPO Tonometry Principles and Procedures Questions and Answers

Question 1

What is considered the 'gold standard' for measuring intraocular pressure (IOP)?

Accepted Answer

Goldmann applanation tonometry (GAT)

Answer

Non-contact tonometry (NCT)

Answer

Schiøtz tonometry

Answer

Digital palpation

Question 2

The Goldmann tonometer measures IOP based on the Imbert-Fick principle, which relates pressure to the ______ required to flatten a specific area of a sphere.

Accepted Answer

Force

Answer

Volume

Answer

Time

Answer

Temperature

Question 3

Which of the following factors can cause a falsely LOW IOP reading with Goldmann tonometry?

Accepted Answer

A thin central cornea

Answer

A thick central cornea

Answer

Patient squeezing their eyelids

Answer

Poor calibration of the tonometer

Question 4

When taking a measurement with a Goldmann tonometer, the correct endpoint is reached when the inner edges of the two fluorescent semi-circles (mires) are:

Accepted Answer

Just touching

Answer

Widely separated

Answer

Overlapping significantly

Answer

Fused into a single solid circle

Question 5

How does a non-contact tonometer (NCT), or 'air-puff' tonometer, measure intraocular pressure?

Accepted Answer

By measuring the corneal response to a puff of air

Answer

By measuring the electrical resistance of the cornea

Answer

By analyzing the reflection of sound waves

Answer

By gently indenting the cornea with a weighted plunger

Question 6

What is a critical step that must be performed before using a Goldmann tonometer tip on a patient?

Accepted Answer

Disinfecting the tip according to office protocol

Answer

Calibrating the tonometer at the '2' mark

Answer

Rinsing the tip with tap water

Answer

Warming the tip to body temperature